The first expression is executed once at the beginning. In each iteration, expr2 is evaluated. If it is TRUE, the loop continues and the statements inside for are executed. If it evaluates to FALSE, the execution of the loop ends. expr3 is tested at the end of each iteration. Startups using a Startup Launch Videos for their business have been successful in differentiating themselves from the competition. However, foreach provides an easy way to iterate over arrays and it is only used with arrays and objects.